کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8132648 | 1523323 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In-flight energy calibration of the space-borne Compton polarimeter POLAR
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
نجوم و فیزیک نجومی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
POLAR is a compact wide-field space-borne detector for precise measurements of the linear polarisation of hard X-rays emitted from gamma-ray burst and solar flares in the energy range of 50 keV to 500 keV. It consists of a 40â¯â¯Ãâ¯â¯40 array of plastic scintillator bars used as a detection material. POLAR was launched into a low Earth orbit on-board the Chinese space-lab TG-2 on September 15, 2016. To achieve high accuracies in polarisation measurements it is essential to perform a precise energy calibration both before and during the flight. Such calibrations are performed with four low activity 22Na radioactive sources placed inside the instrument. Energy conversion factors are related to Compton edge positions from the collinear annihilation photons from the sources. This paper presents the main principles of the in-flight calibration, describes studies of the method based on Monte Carlo simulations and its laboratory verification, and provides some observation results based on the in-flight data analysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Astroparticle Physics - Volume 103, December 2018, Pages 74-86
Journal: Astroparticle Physics - Volume 103, December 2018, Pages 74-86
نویسندگان
Hualin Xiao, Wojtek Hajdas, Bobing Wu, Nicolas Produit, Tianwei Bao, Tancredi Bernasconi, Franck Cadoux, Yongwei Dong, Ken Egli, Neal Gauvin, Merlin Kole, Reinhold Kramert, Siwei Kong, Lu Li, Zhengheng Li, Jiangtao Liu, Xin Liu, Radoslaw Marcinkowski,